Round a floating-point number down to the nearest integer?
Simple int(x) will work as well.
floating-point
How to truncate float values?
round(1.923328437452, 3) See Python’s documentation on the standard types. You’ll need to scroll down a bit to get to the round function. Essentially the second number says how many decimal places to round it to.
How to handle floats and decimal separators with html5 input type number
I think what’s missing in the answers above is the need to specify a different value for the step attribute, which has a default value of 1. If you want the input’s validation algorithm to allow floating-point values, specify a step accordingly. For example, I wanted dollar amounts, so I specified a step like this: … Read more
Printf width specifier to maintain precision of floating-point value
I recommend @Jens Gustedt hexadecimal solution: use %a. OP wants “print with maximum precision (or at least to the most significant decimal)”. A simple example would be to print one seventh as in: #include <float.h> int Digs = DECIMAL_DIG; double OneSeventh = 1.0/7.0; printf(“%.*e\n”, Digs, OneSeventh); // 1.428571428571428492127e-01 But let’s dig deeper … Mathematically, the … Read more
Why doesn’t C have unsigned floats?
Why C++ doesn’t have support for unsigned floats is because there is no equivalent machine code operations for the CPU to execute. So it would be very inefficient to support it. If C++ did support it, then you would be sometimes using an unsigned float and not realizing that your performance has just been killed. … Read more
Why does adding 0.1 multiple times remain lossless?
The rounding error is not random and the way it is implemented it attempts to minimise the error. This means that sometimes the error is not visible, or there is not error. For example 0.1 is not exactly 0.1 i.e. new BigDecimal(“0.1”) < new BigDecimal(0.1) but 0.5 is exactly 1.0/2 This program shows you the … Read more
Why is NaN not equal to NaN? [duplicate]
The accepted answer is 100% without question WRONG. Not halfway wrong or even slightly wrong. I fear this issue is going to confuse and mislead programmers for a long time to come when this question pops up in searches. NaN is designed to propagate through all calculations, infecting them like a virus, so if somewhere … Read more
‘float’ vs. ‘double’ precision
Floating point numbers in C use IEEE 754 encoding. This type of encoding uses a sign, a significand, and an exponent. Because of this encoding, many numbers will have small changes to allow them to be stored. Also, the number of significant digits can change slightly since it is a binary representation, not a decimal … Read more
Is floating-point math consistent in C#? Can it be?
I know of no way to way to make normal floating points deterministic in .net. The JITter is allowed to create code that behaves differently on different platforms(or between different versions of .net). So using normal floats in deterministic .net code is not possible. The workarounds I considered: Implement FixedPoint32 in C#. While this is … Read more
Why does Double.NaN==Double.NaN return false?
NaN means “Not a Number”. Java Language Specification (JLS) Third Edition says: An operation that overflows produces a signed infinity, an operation that underflows produces a denormalized value or a signed zero, and an operation that has no mathematically definite result produces NaN. All numeric operations with NaN as an operand produce NaN as a … Read more